JP2017110853A - Controller for EC fan motor control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for EC fan motor control that uses an EC fan motor so as to save electric power, is compact and lightweight due to use of an electronic controller, and has enhanced flexibility of control and improved fitting property.SOLUTION: A controller 410 for EC fan motor control comprises: a power supply unit 417 which supplies DC electric power for driving an electric circuit in the controller from an EC motor 402 or from outside; a signal input unit to which a signal from a sensor 416 that detects a state of a refrigerant after condensation is input; a fan speed computation unit which computes, based upon the signal from the signal input unit, a rotating speed of a fan so that the rotating speed of the fan decreases as a pressure of the refrigerant decreases; and a control signal output unit 412 which outputs to the EC motor 402 a control signal corresponding to the rotating speed of the fan computed by the fan speed computation unit.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a controller for controlling an electronically commutated (EC) fan motor and a control method therefor.

  Air conditioning equipment such as a heat pump type air conditioner including a compressor, a condenser, an expansion valve, and an evaporator is known. In such an outdoor unit of an air conditioning facility, it is necessary to control the refrigerant pressure to an appropriate state, and for this reason, it is necessary to cool the condensed refrigerant. As a method for cooling the refrigerant, there is an air cooling method in which the fan is rotated to cool the refrigerant with air. In general, in the case of air-cooled type, a fan rotation control device that controls the rotation speed of the fan rotation motor based on the refrigerant pressure is installed so that the cooling capacity fluctuates due to the influence of the outside air condition and the refrigerant pressure does not deviate from the appropriate state Is done.

  Conventionally, DC and AC motors have been used as fan motors for fans used in outdoor units of air conditioning equipment such as air conditioners. An EC motor is also known as a motor that replaces the DC and AC motors. An EC motor is a brushless DC motor that eliminates mechanical contacts such as a brush and a commutator by driving a rotor of a permanent magnet by the magnetic force of a winding circuit of a stator and realizing a current switching by a sensor and an electronic circuit. is there. The EC motor is electronically commutated (EC: Electronically Commutated) because it is electronically commutated using a Hall IC, which is a semiconductor element, and a brush that is a mechanical contact is built into the motor. Since it is not used, it may be called a brushless DC motor (ie, BLDC motor, BL motor).

  In recent years, reduction of power consumption is required to reduce environmental burden. In Europe, the European Energy-related Products Direct (ErP Directive) will come into effect from 2013 to 2015. This seeks to improve energy efficiency for products with an input capacity of 125 W to 500 kW. It is necessary to comply with Japanese products and systems when exporting to Europe. ENERGY STAR is known in the United States, and low power consumption is being promoted in Japan to reduce greenhouse gas emissions.

  EC motors have less copper loss, iron loss, and other losses compared to AC motors commonly used for large fans, etc., and slip loss does not occur in principle. Is done. Further, the EC motor is relatively expensive as compared with the DC motor, but has a feature of high durability and high efficiency. Therefore, in order to reduce power consumption, there is an increasing demand for using an EC motor as a fan motor instead of a DC or AC motor.

JP 2008-1068689 A European Patent Application No. 2501033 British Patent Application No. 2457534

  Patent Document 1 discloses a fan rotation control device that controls the number of fan rotations using a mechanical structure such as a bellows or a potentiometer. Specifically, the fan rotation control device described in Patent Document 1 introduces a refrigerant into a displacement member such as a bellows, expands the displacement of the displacement member due to the refrigerant pressure with an enlargement mechanism, operates the movable terminal, and moves the potentiometer. The resistance value is changed, and the rotational speed of the fan is controlled by an electric signal corresponding to the change in the resistance value. In this type of mechanical controller, the rotational speed characteristic with respect to pressure is limited by the mechanical structure, and optimal control according to the use environment cannot be performed. Moreover, since the pressure detection mechanism and the control output unit are integrated, the size is increased, and a sufficient space is required when directly attaching to the piping. Further, when adjusting the fan rotation speed, it is necessary to perform the adjustment only by the operator's sense without an index of the rotation speed. Further, when using high pressure and low pressure, there is a problem that it is necessary to prepare a plurality of types of controllers.

  Patent Document 2 discloses a control device for changing the voltage supplied to the EC motor. The control device described in Patent Document 2 is configured to generate both pulse voltage and proportional voltage control signals, and when operating at a speed less than the minimum rated speed, the EC motor is operated using the pulse voltage. The control signal is automatically switched from the pulse voltage to the proportional voltage when it is necessary to operate and operate at a speed higher than the minimum rated speed. However, Patent Document 2 does not describe a control device that changes the rotational speed of the fan motor in accordance with the refrigerant pressure of an air conditioner or the like.

  Patent Document 3 describes a fan rotation speed control system for controlling an electric motor driving fan such as an EC motor, or a method thereof. In the fan rotation speed control method described in Patent Document 3, in order to reduce fan noise, an air volume flow rate that fluctuates due to resistance in the system is evaluated, and the fan rotation speed is preset to be substantially constant. Controlled to provide air volume flow. The fan rotation speed control system is configured to monitor the fan rotation speed and limit the fan rotation speed to a fan speed that is not greater than a preset value. However, Patent Document 3 also does not describe a control device that changes the rotation speed of the fan motor in accordance with the refrigerant pressure of an air conditioner or the like.

  Accordingly, the present invention provides an electronic controller for solving the problems of a mechanical controller when an EC motor is used to reduce power consumption as a fan motor for cooling a refrigerant after condensation in an air conditioning facility. It is an object of the present invention to provide an EC fan motor control controller and a control method thereof that achieve a reduction in size and weight, increase the degree of freedom of control, and improve the mountability.

  In order to solve the above problems, an EC fan motor control controller according to the present invention is an EC fan motor control controller that controls an EC motor that drives a fan that cools a refrigerant, and is an internal controller of the EC motor or externally. Based on the signal from the power supply unit that supplies DC power to drive the electrical circuit, the signal input unit that inputs the signal from the sensor that detects the state of the refrigerant after condensation, and the signal from the signal input unit, Corresponds to the fan speed calculator that calculates the fan speed so that the fan speed decreases as the refrigerant pressure decreases, and the fan speed calculated by the fan speed calculator. And a control signal output unit that outputs a control signal to the EC motor.

  The sensor may be a pressure sensor that detects the pressure of the refrigerant.

  The sensor may be a temperature sensor that detects the temperature of the refrigerant.

  The fan speed calculation unit further includes a control range input unit that can adjust a control range in which the rotation speed of the fan is controlled, and the fan speed calculation unit is based on the control range input by the control range input unit. It is good also as what is comprised so that may be calculated.

  Also, an abnormal pressure value input means for setting an abnormal pressure value for determining that the refrigerant pressure is abnormal, and a warning when the refrigerant pressure reaches the abnormal pressure value input by the abnormal pressure value input means. May be further provided with warning output means for outputting.

  Moreover, it is good also as what further has a display apparatus which displays the rotation speed of the said fan.

  The fan speed calculation unit may be configured to calculate the rotation speed of the fan according to an equal percentage characteristic.

  The control signal output unit may be configured to output a PWM control signal.

  The control signal output unit may be configured to output an analog control signal.

  Also, a minimum speed mode input means capable of setting a minimum speed mode for rotating the fan at the set minimum rotation speed when the rotation speed of the fan falls below a set minimum value, and the fan speed calculation. When the rotation speed of the fan calculated in the section reaches the set minimum value or less, in the minimum speed mode, the fan is rotated at the set rotation speed of the minimum value. The minimum speed mode control means may be provided.

  Further, when the rotational speed of the fan is equal to or less than a set minimum value, a cutoff mode input means capable of setting a cutoff mode for stopping the fan, and the rotational speed of the fan calculated by the fan speed calculation unit When the value reaches the set minimum value or less, in the cut-off mode, a cut-off mode control unit configured to stop the fan may be provided.

  The power supply unit supplies the DC power supplied from the EC motor as it is when the EC motor is driven by AC power, and when the EC motor is driven by the DC power, A configuration may be adopted in which DC power supplied from the outside is stepped down and supplied by an internal power step-down unit.

  The EC fan motor control controller may be separate from the sensor.

  The EC fan motor control controller may be integrated with the sensor.

  In order to solve the above problems, the air conditioning system of the present invention includes an EC fan motor control controller, and is configured to be able to select whether the EC fan motor control controller is integrated with or separate from the sensor. Features.

  In order to solve the above-described problems, an EC fan motor control method of the present invention is an EC fan motor control method for controlling an EC motor that drives a fan for cooling a refrigerant. The step of supplying DC power to drive the circuit, the step of inputting a signal from a sensor for detecting the state of the condensed refrigerant, and the pressure from the sensor as the pressure of the refrigerant increases. And a step of calculating the rotational speed of the fan so as to increase the rotational speed of the fan, and a step of outputting a control signal corresponding to the calculated rotational speed of the fan to the EC motor. And

  According to the controller for EC fan motor control of the present invention, by adopting an electronic controller for controlling an EC motor that drives a fan that cools a refrigerant after condensation in an air conditioning facility, the problem of the mechanical controller is reduced. It is possible to eliminate, achieve a reduction in size and weight, increase the degree of freedom of control, and achieve an improvement in attachment.

It is a figure which shows the outline of the system configuration | structure of the air-conditioning equipment with which the controller for EC fan motor control which concerns on this invention is applied. It is a figure which shows the external appearance of an example of the controller for EC fan motor control which concerns on this invention. It is a figure which shows the external appearance of another example of the controller for EC fan motor control which concerns on this invention. It is a system block diagram of the controller for EC fan motor control concerning this invention. It is a figure which shows the control flowchart of the controller for EC fan motor control which concerns on this invention. It is a figure which shows the signal waveform of the PWM control signal output from a control signal output part. It is a figure which shows the pressure sensor output characteristic output from a pressure sensor, and the control signal output characteristic output from a control signal output part. FIG. 8A is a diagram showing a control signal output characteristic output from the control signal output unit, showing a linear characteristic, and FIG. 8B is a diagram showing an equal percent characteristic, FIG. 8C shows the inflection characteristic. FIG. 9A is a diagram for explaining the minimum speed mode and the cut-off mode, and FIG. 9B is a diagram showing control for varying the slope of the proportional band of the control signal output characteristics.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a system configuration of an air conditioning equipment 100 to which an EC fan motor control controller according to the present invention is applied.

  In FIG. 1, an air-conditioning facility 100 is a compressor 101 that compresses refrigerant, an outdoor heat exchanger 102, and an expansion valve that rapidly adiabatically expands high-temperature and high-pressure liquefied refrigerant to lower pressure and temperature. A valve 103, an indoor heat exchanger 104, a four-way switching valve 105, and a refrigerant pipe 106 that connects them are mainly provided. The air conditioning facility 100 is used by switching the cooling cycle and the heating cycle by switching the four-way switching valve 105. In the case of the cooling cycle, the outdoor heat exchanger 102 is used as a condenser that cools the compressed high-temperature and high-pressure gaseous refrigerant to remove heat and turns it into a liquid, and the indoor heat exchanger 104 uses the refrigerant in this. It is used as an evaporator that evaporates and absorbs the necessary latent heat of evaporation from the surroundings. Conversely, in the case of a heating cycle, the outdoor heat exchanger 102 is used as an evaporator, and the indoor heat exchanger 104 is used as a condenser. Note that the compressor 101, the outdoor heat exchanger 102, the expansion valve 103, and the like that are installed outdoors may be configured as an outdoor unit that is also referred to as a condensing unit. In the present embodiment, the air conditioner 100 is applied to an air conditioner or the like that can switch between a cooling cycle and a heating cycle. However, the air conditioning facility 100 may be applied to a refrigerator or the like having only a cooling cycle.

  In the outdoor heat exchanger 102 of the air conditioning equipment 100, it is necessary to control the refrigerant pressure to an appropriate state. In the case of an air cooling system, the fan 111 is rotated in order to cool the condensed refrigerant during the cooling cycle. In general, the condenser cooling fan 111 is basically driven at 100%. For example, in order to prevent the outside air temperature from falling and the refrigerant pressure from being lowered too much, such as at night, the controller sets the rotation speed of the fan. It is necessary to drop and keep the pressure constant. The EC fan motor control controller 114 of the present invention controls the fan rotation speed according to the pressure of the condensed refrigerant detected by the pressure sensor 113 and drives the EC motor 112 to rotate the fan 111. The fan 111, the EC motor 112, the pressure sensor 113, and the EC fan motor control controller 114 may be mounted integrally with the outdoor unit, or may be separately installed later. In the present embodiment, the state of the refrigerant after condensation is detected by the pressure sensor 113, but the present invention is not limited to this, and the state of the refrigerant after condensation may be detected by a temperature sensor.

  FIG. 2 is a diagram showing the appearance of an example 200 of an EC fan motor control controller according to the present invention.

  In FIG. 2, the EC fan motor control controller 200 includes a control unit 201 and a pressure sensor 202, and a pressure detection signal from the pressure sensor 202 is transmitted to the control unit 201 via a signal line 203. The Since the control unit 201 and the pressure sensor 202 are separated from each other, only the pressure sensor 202 can be attached to the pipe, so that only the pressure sensor 202 can be attached to the pipe even in a small space around the pipe. effective. The control unit 201 can be freely installed on a panel frame or a control panel. The control unit 201 displays a rotation speed display device 201a that displays the rotation speed of the fan 111 by changing the blinking speed of the LED and the like, and a warning display that lights the LED and the like when the refrigerant pressure reaches a pressure abnormal value The apparatus 201b and an adjustment capable of adjusting a control range such as a pressure range in which the rotation speed of the fan 111 is controlled, or an abnormal pressure value at which the refrigerant pressure is determined to be abnormal, as will be described in detail below. A setting input device 201c which is a knob.

  For example, the pressure value of the refrigerant can be adjusted by turning the setting input device 201c, which is an adjustment knob, in a state in which it is confirmed by the blinking of the rotation number display device 201a that the rotation number of the fan 111 has reached a predetermined rotation number. Then, the control range in which the rotation speed of the fan 111 is controlled can be adjusted. Here, although the adjustment knob is used as the setting input device 201c, a trimmer, a potentiometer, or the like may be used. In addition, as a case where the pressure is determined to be abnormal, the pressure increases even though the rotation speed of the fan 111 is 100%, for example, the control unit 201, the pressure sensor 202, or the signal line 203 There are cases where the pressure value becomes abnormal due to disconnection or short circuit, and the pressure signal value from the pressure sensor 202 is far from the set pressure value.

  FIG. 3 is a diagram showing the appearance of another example 300 of the controller for controlling the EC fan motor according to the present invention.

  In FIG. 3, the EC fan motor control controller 300 has an integral shape incorporating a pressure sensor unit 302. Note that, by adopting such an integral shape, the EC fan motor control controller 300 can be attached by a single attachment when an attachment space is allowed. The EC fan motor control controller 300 includes a display device 301 capable of displaying the refrigerant pressure value input from the pressure sensor unit 302, the rotation speed of the fan 111, the refrigerant temperature, and the like, and a plurality of setting inputs. Setting input devices 303a to 303f. Here, the display device 301 is a device that displays numbers in segment display, but is not limited to this as long as the pressure value of the refrigerant, the rotation speed of the fan 111, and the like can be displayed. The plurality of setting input devices 303a to 303f include a pressure switch 303a for displaying the refrigerant pressure on the display device 301, an output switch 303b for displaying the rotation speed of the fan 111, and a setting mode for displaying various setting values. Switch 303c, PWM switch 303d for inputting a fan control signal mode for switching a PWM control signal shown in FIG. 6 to be described later, an analog control signal in which the control signal changes in proportion to the rotation speed of the fan 111, and the like. There are a determination switch 303e for confirming and an up / down switch 303f for changing the set value up and down, but it is not limited thereto.

  FIG. 4 is a system block diagram 400 of an EC fan motor control controller according to the present invention.

  4, the system block diagram 400 mainly includes an EC fan motor control controller 410, an external power supply 401, an EC motor 402, an external control unit 403 such as a personal computer, and a refrigerant pipe 404. The EC fan motor control controller 410 includes a calculation unit 411 that calculates the number of rotations of the fan 111 based on the refrigerant pressure detected by the pressure sensor 416 from the refrigerant pipe 404, and the calculation unit 411. A control signal output unit 412 that outputs a control signal corresponding to the rotational speed of the fan 111 to the EC motor 402, a setting input unit 413 including a switch or a trimmer, a display unit 414 including a segment display, LED blinking, and the like An external communication unit 415 that transmits and receives signals to and from the external control unit 403 via, for example, RS485 is mainly included. The pressure sensor 416 may be integrated with the EC fan motor control controller 410 as shown in FIG. 2 and FIG.

  As is well known, the EC motor 402 is mainly driven by an AC power source, but can also be driven by a DC power source. In the present embodiment, the external power source 401 is described as being able to use a DC power source or an AC power source. . When the external power source 401 is an AC power source (for example, AC 200 to 240 V or AC 100 to 120 V), a DC power source (for example, 0 to 10 V) rectified by a rectifier mounted on the EC motor 402 is external to the EC motor 402. Obtained from the output terminal and supplied to the electrical circuit of the controller as it is. When the external power supply 401 is a DC power supply (for example, DC 24 to 48 V), the external power supply 401 is supplied to the controller as it is, and is stepped down by the regulator 417 inside the controller (for example, DC 10 V) and supplied to the electric circuit inside the controller. . The external control unit 403 such as a personal computer can transmit contents that can be set and input by the setting input devices 201c and 303a to 303f shown in FIGS. 2 and 3, for example.

  FIG. 5 is a diagram showing a control flowchart 500 of the controller for controlling the EC fan motor according to the present invention.

  In FIG. 5, in step S501, a pressure value is input from the pressure sensor 113, and the process proceeds to step S503. In step S502, an abnormal pressure value is set and input by the setting input devices 201c, 303a to 303f and the like shown in FIGS. 2 and 3, and in step S503, the pressure value acquired in step S501 exceeds the abnormal pressure value. Or whether the pressure is abnormally low. If it is determined that the pressure value is abnormal, the process proceeds to step S504, and an alarm is output from the display devices 202b and 301 shown in FIGS.

  If it is determined in step S503 that the pressure value is not abnormal, the process proceeds to step S506. In step S505, a control range such as a pressure range in which the rotation speed of the fan 111, which will be described later, is controlled is adjusted by the setting input devices 201c, 303a to 303f and the like shown in FIGS. In step S506, the rotation speed of the fan 111 is calculated based on the pressure value input in step S501 and the control range adjusted in step S505, and the process proceeds to step S508. In step S508, it is determined whether or not the rotation speed of the fan 111 is equal to or less than the set minimum value. If it is determined that the rotation speed of the fan 111 is equal to or less than the set minimum value, the process proceeds to step S509. Note that the minimum value set for the rotation speed of the fan 111 may be a value stored in advance in a memory or the like (for example, 10% of the maximum rotation speed), or the setting input device 201c shown in FIG. 2 and FIG. , 303a to 303f, etc.

  In step S507, when the number of rotations of the fan 111 calculated in step S506 is equal to or less than the set minimum value by the setting input devices 201c, 303a to 303f shown in FIG. 2 and FIG. A minimum speed mode in which 111 is rotated at the set minimum number of rotations or a cut-off mode in which the fan 111 is stopped is set, and the process proceeds to step S509. In step S509, it is determined whether the minimum speed mode or the cut-off mode is set. If the minimum speed mode is set, the process proceeds to step S513, and the fan 111 is turned on at the set minimum rotational speed. When the control signal is output so as to rotate, and in the cut-off mode, the process proceeds to step S510, the control signal output is set to zero, and the fan 111 is stopped.

  If it is determined in step S508 that the rotation speed of the fan 111 is not less than the set minimum value, the process proceeds to step S512. In step S511, the fan control signal mode for switching between the PWM control signal and the analog control signal is input by the setting input devices 201c, 303a to 303f and the like shown in FIGS. In step S512, a control signal is output to the EC motor 112 based on the rotation speed of the fan 111 calculated in step S506 and the fan control signal mode input in step S511, and the process proceeds to step S514. In step S514, the number of rotations of the fan 111 is displayed on the display devices 202a and 301 shown in FIGS. 2 and 3, and the process ends.

  FIG. 6 is a diagram illustrating a signal waveform of the PWM control signal output from the control signal output unit 412.

  In FIG. 6, the horizontal axis indicates time, and the vertical axis indicates voltage [V]. The PWM control adjusts the electric power for driving the EC motor 112 by adjusting the pulse width of the rectangular pulse with respect to the analog control in which the control signal changes in proportion to the rotational speed of the fan 111, and the rotational speed. It is the control method which controls. As shown in FIG. 6, in this embodiment, the period is constant, and the ON time is adjusted to adjust the pulse width (0 to 100%).

  FIG. 7 is a diagram illustrating a pressure sensor output characteristic output from the pressure sensor 113 and a control signal output characteristic output from the control signal output unit 412.

  In FIG. 7, the solid line indicates the control signal output characteristic, the dotted line indicates the pressure sensor output characteristic, the horizontal axis indicates the pressure [MPa], and the vertical axis indicates the ratio [%] of the control signal output characteristic and the pressure sensor output characteristic. The voltage [V] is shown respectively. The pressure sensor output characteristic (voltage [V]) has a characteristic that changes linearly with respect to the detected refrigerant pressure [MPa]. The control signal output characteristic (ratio [%]) is calculated so that the rotation speed of the fan 111 decreases as the refrigerant pressure decreases. Here, the equal percentage characteristic shown in FIG. It is shown. As shown in FIG. 7, the control signal output characteristic is controlled proportionally to the pressure by the setting input devices 201c, 303a to 303f shown in FIGS. 2 and 3 as described above. Control range such as proportional pressure range can be adjusted. Thereby, when the outdoor heat exchanger 102 used as a condenser is replaced, the control range of the proportional band can be adjusted according to the maximum condensing pressure of the refrigerant, and the refrigerant can be efficiently cooled. it can. This adjustment can be performed, for example, by checking the number of revolutions and setting the refrigerant pressure while confirming that the number of revolutions has been reached.

  FIG. 8A is a diagram illustrating the control signal output characteristics output from the control signal output unit 412 and is a diagram illustrating linear characteristics. FIG. 8B is a diagram illustrating the equal percent characteristics. FIG. 8C is a diagram showing inflection characteristics.

  8A to 8C, the vertical axis indicates the ratio [%] of the control signal output characteristic, and the horizontal axis indicates the pressure [MPa]. As shown in FIG. 8A, the linear characteristic indicates a characteristic that changes to a straight line, and as shown in FIG. 8B, the equal percentage characteristic indicates a characteristic that changes to a straight line on the semilogarithmic graph. As shown in (c), the inflection characteristic indicates a characteristic of a broken line in which a straight line bends in the middle. Such control signal output characteristics may be fixed from the beginning, or may be changed by the setting input devices 201c, 303a to 303f shown in FIG. 2 and FIG. Further, by utilizing such characteristics, it is possible to perform highly accurate control in a low rotation region, and to achieve low power consumption.

  FIG. 9A is a diagram for explaining the minimum speed mode and the cut-off mode, and FIG. 9B is a diagram showing control for varying the slope of the proportional band of the control signal output characteristics.

  9A and 9B, the vertical axis indicates the ratio [%] of the control signal output characteristic, and the horizontal axis indicates the pressure [MPa]. As shown in FIG. 9A, as described above, in the minimum speed mode, when the number of rotations of the fan 111 calculated by the calculation unit 411 reaches a set minimum value or less, the minimum speed mode is set. In this mode, the fan 111 is controlled to rotate at the number of revolutions. The cut-off mode stops the fan 111 when the number of revolutions of the fan 111 calculated by the calculation unit 411 reaches a set minimum value or less. It is a mode to control as follows. In this case, when the refrigerant is in a low pressure state (low temperature state), the fan 111 is stopped so as not to cool the refrigerant as much as possible. In this embodiment, the minimum speed mode or the cut-off mode is set by the setting input devices 201c, 303a to 303f shown in FIGS. 2 and 3, but the minimum speed mode or the cut-off mode is set in advance. It may be fixed.

  As shown in FIG. 9B, the setting input devices 201c, 303a to 303f shown in FIG. 2 and FIG. 3 can be used to perform control to vary the slope of the proportional band of the control signal output characteristics. As a result, when there is a temperature difference between the daytime and nighttime, the refrigerant temperature (pressure) also changes, so a wider range of controls such as changing the slope of the proportional band and switching the fan control mode. It can be performed.

  As described above, according to the EC fan motor control controller of the present invention, by adopting an electronic controller for controlling the EC motor that drives the fan that cools the refrigerant after condensation in the air conditioning equipment, The problems of the type controller can be solved, the size and weight can be reduced, the degree of freedom of control can be increased, and the improvement of the mountability can be achieved.

DESCRIPTION OF SYMBOLS 100 Air-conditioning equipment 101 Compressor 102 Outdoor heat exchanger 103 Expansion valve 104 Indoor heat exchanger 105 Four-way switching valve 106, 404 Refrigerant piping 111 Fan 112, 402 EC motor 113, 202, 416 Pressure sensor 114, 200, 300, 410 EC Fan motor controller 201 Control unit 201a, 201b, 301 Display device 201c, 303a-303f Setting input device 203 Signal line 302 Pressure sensor unit 400 System block diagram 401 External power supply 403 External control unit 411 Calculation unit 412 Control signal output unit 413 Setting input unit 414 Display unit 415 External communication unit 417 Regulator

Claims (16)

An EC fan motor control controller that controls an EC motor that drives a fan that cools the refrigerant,
A power supply section for supplying DC power to drive the EC motor or an electric circuit inside the controller from the outside;
A signal input unit for inputting a signal from a sensor for detecting the state of the refrigerant after condensation;
Based on a signal from the signal input unit, a fan speed calculation unit that calculates the rotation speed of the fan so that the rotation speed of the fan decreases as the pressure of the refrigerant decreases;
A controller for EC fan motor control, comprising: a control signal output unit that outputs a control signal corresponding to the rotation speed of the fan calculated by the fan speed calculation unit to the EC motor.   The EC fan motor control controller according to claim 1, wherein the sensor is a pressure sensor that detects a pressure of the refrigerant.   The EC fan motor control controller according to claim 1, wherein the sensor is a temperature sensor that detects a temperature of the refrigerant. A control range input means capable of adjusting a control range in which the rotation speed of the fan is controlled;
2. The EC fan motor control according to claim 1, wherein the fan speed calculation unit is configured to calculate a rotation speed of the fan based on a control range input by the control range input unit. controller. An abnormal pressure value input means for setting an abnormal pressure value at which the pressure of the refrigerant is determined to be abnormal;
The EC fan motor control according to claim 1, further comprising warning output means for outputting a warning when the pressure of the refrigerant reaches the abnormal pressure value input by the abnormal pressure value input means. Controller.   The controller for controlling an EC fan motor according to claim 1, further comprising a display device that displays the number of rotations of the fan.   2. The EC fan motor control controller according to claim 1, wherein the fan speed calculation unit is configured to calculate a rotation speed of the fan in accordance with an equal percentage characteristic.   The controller for EC fan motor control according to claim 1, wherein the control signal output unit is configured to output a PWM control signal.   The controller for EC fan motor control according to claim 1, wherein the control signal output unit is configured to output an analog control signal. A minimum speed mode input means capable of setting a minimum speed mode for rotating the fan at a rotation speed of the set minimum value when the rotation speed of the fan is equal to or less than a set minimum value;
When the rotation speed of the fan calculated by the fan speed calculation section reaches the set minimum value or less, in the minimum speed mode, the fan is rotated at the rotation speed of the set minimum value. The controller for EC fan motor control according to claim 1, further comprising: minimum speed mode control means configured to cause the controller to operate. Cut-off mode input means capable of setting a cut-off mode for stopping the fan when the rotation speed of the fan is equal to or less than a set minimum value;
Cut-off mode control configured to stop the fan in the cut-off mode when the rotation speed of the fan calculated by the fan speed calculation unit reaches the set minimum value or less. The EC fan motor control controller according to claim 1, further comprising: means.   The power supply unit supplies DC power supplied from the EC motor as it is when the EC motor is driven by AC power, and externally when the EC motor is driven by DC power. 2. The EC fan motor control controller according to claim 1, wherein the controller is configured to step down and supply the supplied DC power by an internal power step-down unit.   The EC fan motor control controller according to claim 1, wherein the EC fan motor control controller is separate from the sensor.   The EC fan motor control controller according to claim 1, wherein the EC fan motor control controller is integrated with the sensor. An air conditioning system comprising the EC fan motor control controller according to claim 1,
An air conditioning system characterized in that the EC fan motor control controller can be selected to be integrated with or separate from the sensor. An EC fan motor control method for controlling an EC motor that drives a fan that cools a refrigerant,
Supplying DC power to drive an electric circuit inside the controller from the EC motor or from the outside;
Inputting a signal from a sensor for detecting the state of the condensed refrigerant;
Based on the signal from the sensor, calculating the rotational speed of the fan so that the rotational speed of the fan increases as the pressure of the refrigerant increases;
And a step of outputting a control signal corresponding to the calculated rotation speed of the fan to the EC motor.

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